It's seems that even if we consider that the fly is always colliding with the same train (instead of zig-zagging between trains), the results are always the same.
Figurate number triangle
Project Euler: Problem 6, Natural numbers, squares and sums.
Number of Horns on a unicorn!
The Answer to Life, the Universe, and Everything
Who invented zero?
Smallest distance between a point and a rectangle
singularity 2.0 (easier)
the proud tradition of zero scores in Cody
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